Skiving machine



July 16, 1929.

A. R. RIDDERSTROM SKIVING MACHINE 2 Sheets-Sheet 1 Filed Oct. 13, 1923 Inventor" fin draw 1?. Did derstr'orn y 16, 1929- A. R. RfiDDERsTRoM ,7 5

SKIVING MACHINE Filed Oct. 15, 1923 2 Sheets-Sheet 2 ln/venfb o1" flnzirewR.R1ldd eratrom 11 (it urn 0g Patented July 16, 1929.

UETED-STATES PATENT OFFICE.

ANDREW R. RIDDERSTBOM, OF .INAI-IANT, MASSACHUSETTS, ASSIGNOR, BY MESNE AS- SIGNMENTS, TO UNITED SHOE MACHINERY CORPORATION, OFQPATEBSON, NEW JERSEY, A CORPORATIONOF NEVV' JERSEY.

SKIVING MACHINE.

Application filed October 13, 1923.

The present invention relates to skiving machines, and more particularly to machines such as are used in shoe factories to skive the margins of shoe uppers.

The chief object of the invention is to provide an improved presser foot and gage. Other objects will appear from the following description, taken in connection with the accompanying drawings, and will he particularly pointed out in. the appended claims,

. it being understood that it is intended to set forth in the claims all the novelty that the invention may possess.

lVith these objects in view, the invention consists of the machine hereinafter described, illustrated in the accompanying drawings, and defined in the appended claims.

In the accompanying drawings, Fig. is a perspective view of the forward portion of a skiving machine, illustrating a preferred embodiment of the present invention; Fig. 2 is a section taken upon the line 22 of Fig. 1, looking in the direction of the arrows; Fig. 3 is a fragmentary rear elevation; Figs. 4 and 5 are sections taken upon the lines 4 l and 5 5, respectively, of Fig. 1, looking in the direction of the arrows; Fig. (3 is a fragmentary plan of a modification; Fig. 7 is a front elevation of the same; F 8 and 9 are sections taken upon the lines S8 and 9-9, respectively, of Fig. 6, looking in the direction of the arrows; and Fig. 10 is a section taken upon the line 1010 of Fig. 7,1ooking in the direction of the arrows.

The preferred embodiment of the present invention is illustrated in Figs. 1 to 5 inclusive as appliedto a machine that is more fully illustrated and described in a copending application, Serial No. 521,239, filed De.- cember 9, 1921. The machine illustrated in the modification of Figs. 6 to 10 inclusive constitutes the subject matter of a copending application, Serial No. 564,718, filed May 81, 1922, of which the present application is a continuation inpartr It is not necessary to describe either of these machines in detail, in order to obtain an understanding of the present invention, as the invention is equally applicable to othermachines of well known type, but reference is made to the above-named applications for ,a fuller description of such portions of the machines Serial No. 668,347.

as it is considered to be unnecessary to illustrate and describe herein.

In skiving machines of the above-designated character, the shoe upper is usually advanced by a feed roll 95 and a feed disk 1 1-3 to a rotating skiving knife 185 that cuts a scarf in. the margin of the material. The feed roll 95 shown in the preferred embodiment of the invention is provided with a frusto-conical working face 127 and is shown mounted upon a feed-roll shaft 83 ournaled in a sub-frame 86 that is housed in a base portion 21 of the frame of the machine. In the modification, the feed-roll 95 comprises two feed rolls 95 and 95 inclined at an angle to each other, as shown in Figs. 6 and 7, and adapted to rotate in opposite directions away from each other to stretch the stock as it is fed forward, preventing wrinkling or bunching. The feed disk is mounted at the lower end of a feed-disk shaft 137.tl1at, together with the knife shaft 181, is carried by an overhanging arm (not shown) of the frame of the machine. In the preferred embodiment of the invention, the feed roll 95 and the feed disk 143are maintained, within small limits of adjustment, in the positions illustrated. According to the modification, the feed rolls 95 and 95 are angularly adjustable as a. unit, at the will of the operator, to vary the angle of scarf; and the feed disk 143 is adjustable at the same time, so asto maintain the relative positions of the feed roll and the feed disk unchanged, and their cooperative feeding action, therefore, unimpaired. this end, the feed rolls 95 and 95 are carried upon the outer end ofv a tiltable arm 12 that is intermediately pivoted upon a ball head, as more fully described in the said application Serial No. 564,718. A presser foot 131 and a guide, lip or gage 132 are provided close to the knife 185 to cooperate with the feed roll 95 and the feed disk 143, properly to guide the work and hold it in place. The gage 132 shown in Fi s. 1 to 5 rests against the working face 124 of the feed roll 95, and is curved to conform to the same. In Figs. 6 to 10, it is of somewhat diiferent construction. In each case, the gage limits the extent of the scarf, so that the margins of various uppers shall be skived uniformly, and the presser foot presses the leather or other stock yieldingly against the feed roll 95. The presser foot 131 yields both vertically and pivotally to accommodate itself to variations in the thickness of the leather, but in the illustrated, normal position, its work-engaging face is parallel to, or in contact with, the adjacent workengaging face 127 of the feed roll 95, and plays a corresponding function in. cooperation ith the ilieed rolls 95 and 95.

The novel presser foot of the present invention is carried at the free, outer end of a leat-spring arm The said free outer end of the spring arm is resiliently movable towards and from the feed roll. The spring arm 125, and also the gage 132, are mounted upon a holder or block 119. In the preferred embodiment of the invention, the holder or block 119 is adjustably secured to the sub-frame 8G in any desired manner. as by means of one or more set screws 118 that extend tl'irough one or more elongated openings 120 in the block 119 and are tapped in the sub-frame, to one side thereof. The elon gated openings 120 may provide either for horizontal adjustment, or vertical adjustment, or both. In the modification of Figs, (3 to 10 inclusive, the holder or block 119 is shown integral with the same tilting arm 12 that carries the feed rolls 95 and 95, so that the feed rolls, the feed disk, the presser toot and the gage will tilt together as a unit.- The spring arm 125 is supported upon a block that secured to the block 119 by a screw or screws 92. The gage 132 is adjustably secured to, and is removable from, the block 1.19 by means of a screw 84-.

The presser toot 131 is in each case intermediately yieldingly mounted on the outer end of the spring arm 125. According to the preferred embodiment of the invention. a lug 130 of the presser foot 131 is intermediately pivoted between ears 128 at 129. The cars 128 serve as a guide for the presser toot durdrical stem by means of which the presser.

foot is intern'iediately -freely journaled in a bore 58 that is provided at the'free end of the spring arm 125. The axis of the bore intersects the plane of feed and is preferably inclined upward in the direction of feed. The free end of a leaf spring 60, that is tastened to the spring arm by a screw or other mechanism 62, loosely engages a tla t shoulder 61 of the presser foot 131 to maintain the presser foot yieldingly against rotative movement about the pivotal point 129 (Figs. 1 to or about the axis of the bore (Figs. 6 to 10). The spring 60, it will be noted, acts at points, such as the points (36 and 68, that i are situated upon opposite sides of the pivotal point of the presser foot, so as yieldingly to oppose tilting movement of the presser toot in either direction ilrom the lllustrated, normal position. If the prcsser :loot should be forced by the stock to tilt in the direction indicated by the arrow 79, Figs. 3 and 7, it will be returned to the normal positionby the action (it the springbtl at the point (38. The spring 61) will sinnlarly cturn the D1 sser foot to its normal position, through its action at the point (So, it the displacement ot the presser tent is in the direction of the arrow 72 The presser foot is thus, in each case, yieldingly carried at the free end of the spring arm 125, and its oscillations, in either direction, are yieldingly opposed by the spring 60,

Both the spring arm 125 and the spring (30 are adjustable, the former by means of two screw-threaded members 741 and 7(5, and the latter by means or the screw or other meclmnism 62. The adjustment of the spring arm 125 will require a little detailed explanation. The rear or inner end ot' the spring arm 125 is mounted in recesses 87 ot the screw threaded members 71 and 7(3, and is maintained between the walls of these recesses and a wall 88, Figs. 5 and 10, 01 the support 80. Thumb nuts 99 and 92 are threaded upon the screw-threaded portions of the screw-threaded members Tet and 76, respectively, to provide for vertical adjustment of the screw-threaded members. 13y lmvering the scrow-threaded member-74, for example, and raising the scre\v-threaded member 76, the presser foot 131 may be lowered relatively to the feed roll 95. Reverse adjustment will raise the presser toot. These adjustments will be guided about a screw 94: that is threaded into the support 80 and that may act ilurther to clamp the spring arm 125 to the support 80.

The presser toot 1.31 of the preferred coir struction is endowed with but a very limited range of pivotal, movement about the pivotal point 129, the range 01 pivotal movement being determined by the walls of a V-shaped recess 229 within which extends a lug 230 of the presser foot. The V-shaped recess 229 is provided upon a stationary portion of the machine.

Many parts of the machines have purposely not been illustrated, in order not to distract attention from the features of essential novelty. Fuller explanation of such portions of the. machines will be found in the eopending applications above referred to. It will be understood that the features of novelty may be embodied in other machines, and in machines of other types, and

that modifications may be made by persons skilled in the art without departing from the spirit and scope of the invention, as defined in the appended claims.

lVhat is claimed is:

1. A skiving machine having, in combination, a knife, a feed roll, an intermediately pivoted presser foot, and a single spring acting upon thepresser foot upon both sides of its pivotal point. v

2. In a machine of the character described, a revoluble knife, a feed roll, a presser foot cooperating with the knife and with the feed roll, a pivotal point disposed intermediate the ends of the presser foot, means for yieldingly mounting the presser foot about the pivotal point, and a leaf spring acting upon the presser foot upon both sides of its pivotal point.

3. A presser-foot construction comprising a leaf spring, a presser foot intermediately pivoted to an end of the leaf spring, and a single spring acting upon the presser foot upon both sides of the pivotal point.

4. A skiving machine having, in combination, a knife, a feed roll, a leaf spring the outer end of which is movable towards and from the roll, a presser foot intermediately pivoted to the outer end of the leaf spring, and a single spring acting upon the presser foot upon both sides of its pivotal point.

5. A skiving machine having, in combination, a knife, a feed roll, a support, a leaf spring fastened to the support in such a manner that its outer end is movable toward and from the roll, a presser foot carried by the outer end of the leaf spring and movable relatively thereto, a pivotal point disposed intermediate the ends of the presser foot, and a leaf spring acting upon the presser foot upon both sides of the said pivotal point.

6. A skiving machine having, in combination, a knife, a feed roll, a pivoted presser foot having a flat shoulder, and a spring loosely engaging the flat shoulder tending to maintain the presser foot yieldingly in a predetermined pivotal position.

7. A skiving machine having, in combination, a knife, a feed roll, a support, two adjusting members adjustably mounted upon the support, the adjusting members being provided with alined recesses, a presser-foot support carried upon the first-named support and having a portion extending in the recesses, whereby adjustment of the adjusting members Will effect an adjustment of the presserfoot support, a presser foot carried by the presser-foot support, and a member for clamping the presser-foot support to the first-named support in adjusted position.

8. A'skiving machine having, in combination, a knife, a feed roll, a support, a presser-foot support carried upon the firstnamed support, a presser foot carried by the presser-foot support, a guiding screw and two screws on opposite sides of the guiding screw mounted upon the first-named support and cooperating with the guiding screw to adjust and clamp the presser-foot support upon the first-named support, the guiding screw being disposed at right angles to the tWo other screws and serving as a pivot and a clamp, and the two other screws serving as adjusting means.

9. A skiving machine having, in combination, a knife, a feed roll, a presser-foot support having a pivot and a recess, and a presser foot freely pivoted about the pivot during the operation of the machine and having a projection mounted in the recess.

10. A skiving machine having, in combination, a knife, a feed. roll, a member having a recess, a leaf spring the outer end of which is movable towards and from the roll, and a presser foot intermediately pivoted freely to the outer end of the leaf spring during the operation of the machine and having a projection mounted in the recess.

In testimony whereof, I have hereunto subscribed my name this 11th day of- October, 1923.

ANDREW R. RIDDERSTROM. 

